package com.oa.ylms.apps.common;

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;

public class InputStream2Byte {
	@SuppressWarnings("unchecked")
	public static byte[] getBytes(InputStream is)throws Exception
    {
        byte[] data = null;
        
        Collection chunks = new ArrayList();
        byte[] buffer = new byte[1024*1000];
        int read = -1;
        int size = 0;
        
        while((read=is.read(buffer))!=-1)
        {
            if(read>0)
            {
                byte[] chunk = new byte[read];
                System.arraycopy(buffer,0,chunk,0,read);
                chunks.add(chunk);
                size += chunk.length;
            }
        }       
        
        if(size>0)
        {
            ByteArrayOutputStream bos = null;
            try
            {
                bos = new ByteArrayOutputStream(size);
                for(Iterator itr=chunks.iterator();itr.hasNext();)
                {
                    byte[] chunk = (byte[])itr.next();
                    bos.write(chunk);
                }
                data = bos.toByteArray();
            }
            finally
            {
                if(bos!=null)
                {
                    bos.close();
                }
            }
        }
        return data;
    }
}
